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section on json validation

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README.md
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@ -31,7 +31,7 @@ $ go get -u github.com/tidwall/gjson
This will retrieve the library. This will retrieve the library.
## Get a value ## Get a value
Get searches json for the specified path. A path is in dot syntax, such as "name.last" or "age". This function expects that the json is well-formed. Bad json will not panic, but it may return back unexpected results. When the value is found it's returned immediately. Get searches json for the specified path. A path is in dot syntax, such as "name.last" or "age". When the value is found it's returned immediately.
```go ```go
package main package main
@ -275,6 +275,19 @@ if gjson.Get(json, "name.last").Exists() {
} }
``` ```
## Validate JSON
The `Get*` and `Parse*` functions expects that the json is well-formed. Bad json will not panic, but it may return back unexpected results.
If you are consuming JSON from an unpredictable source then you may want to validate prior to using GJSON.
```go
if !gjson.Valid(json) {
return errors.New("invalid json")
}
value := gjson.Get(json, "name.last")
```
## Unmarshal to a map ## Unmarshal to a map
To unmarshal to a `map[string]interface{}`: To unmarshal to a `map[string]interface{}`: